DE10105883C2 - piston holder - Google Patents

piston holder

Info

Publication number
DE10105883C2
DE10105883C2 DE2001105883 DE10105883A DE10105883C2 DE 10105883 C2 DE10105883 C2 DE 10105883C2 DE 2001105883 DE2001105883 DE 2001105883 DE 10105883 A DE10105883 A DE 10105883A DE 10105883 C2 DE10105883 C2 DE 10105883C2
Authority
DE
Germany
Prior art keywords
piston
driving piston
driving
characterized
holder according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
DE2001105883
Other languages
German (de)
Other versions
DE10105883A1 (en
Inventor
Markus Frommelt
Franz Buechel
Stefan Boenig
Thomas Sperrfechter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HILTI AKTIENGESELLSCHAFT, SCHAAN, LI
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to DE2001105883 priority Critical patent/DE10105883C2/en
Publication of DE10105883A1 publication Critical patent/DE10105883A1/en
Application granted granted Critical
Publication of DE10105883C2 publication Critical patent/DE10105883C2/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25CHAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00Hand-held nailing tools; Nail feeding devices
    • B25C1/08Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/10Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
    • B25C1/14Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/19Pyrotechnical actuators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/26Locking mechanisms
    • F15B15/262Locking mechanisms using friction, e.g. brake pads

Abstract

Piston holder, in particular for a driving piston (8) of a setting tool, which has a cylindrical section (10a) and a wedge-shaped section (10b) adjoining it to the rear end of the driving piston (8) with a wedge surface (20) which is inclined towards the rear of the central piston axis (16). 18). The piston holder includes at least one brake element (23) which, when the drive piston (8) is in an operational readiness position, presses against the cylindrical section (10a) and its pressure force on the drive piston (8) is reduced when the brake element (23) moves the drive piston ( 8) comes to lie in the forward direction opposite the wedge surface (18). As a result, the driving piston can be guided with low friction, returned to its ignition-ready position under braking action and held there securely.

Description

The invention relates to a piston holder according to the in claim 1 Art.

EP 0 346 275 B1 (DE 38 19 813 A1) already discloses a piston holder for a powder power operated setting tool with a piston guide and a slidable therein Driving piston known, in the piston guide one towards the driving piston ra dial open recess with brake balls resting on the driving piston and Fe which is intended for the brake balls. In ignition ready position the brake balls supported on the spring washer on the lateral surface of the Shaft of the driving piston. The driving piston moves in the driving in direction tion, the driver takes the brake balls with them when they start moving. The Brake balls tension the spring ring, the support surface being the radial one Introduces spring force of the spring ring into the brake balls. The from the spring washer radi Brake balls pressed against the shaft of the driving piston thus practice one  Braking effect on the driving piston. Already by slight shift The braking effect can be canceled by moving the driving piston backwards. by moving the brake balls against the driving direction and the Spring ring relaxed. After relaxing the spring ring, it presses the Brake balls no longer against the shaft of the driving piston. With that the Braking effect against the driving piston canceled.

The invention has for its object a piston holder of the beginning mentioned type to create the propellant in the ready position holds securely, brakes it with only a short lead and only brakes again shortly before reaching its ignition ready position.

The solution to the problem is set out in claim 1. advantageous Embodiments of the invention can be found in the subclaims.

A piston holder according to the invention can, for. B. at a pulverized power driven setting tool are used or in such a way that Ignition of an air / fuel gas mixture is driven. The driving piston has a cylindrical section and one to the rear End of the driving piston adjoins the wedge-shaped section with egg ner wedge surface inclined backwards to the central piston axis. The pistons Bracket contains at least one braking element that in a Betriebsbe pressing position of the driving piston presses against the cylindrical section, and its pressure force on the drive piston is reduced when the brake ment when the driving piston moves in the forward direction with respect to the wedge surface che comes to rest.

The driving piston is in its ready position, i.e. in its starting or ignition ready position, it is activated by the brake selement held securely in this position, since it has sufficient Braking force presses against the cylindrical portion of the drive piston. In the fall When the setting tool is ignited, the driving piston is driven in the driving-in direction or Forward direction (setting direction) driven so that now the wedge surface Brake element is opposite. Since the wedge surface towards the rear end of the blowing piston is inclined towards its central axis, it moves away from Movement of the driving piston in the forward direction more and more of the braking element,  so this no longer has such a strong pushing force and eventually can no longer apply any pressure force to the driving piston. The The driving piston now runs relatively freely in the forward direction. He returns his movement direction around, it is initially by the braking device at all not braked until the wedge surface comes into contact with it again and the braking element only now begins to brake the driving piston, so he switches his ignition ready position back on at a lower speed can take. Finally, the braking element comes back on the cylinder section of the driving piston to hold it. The whole The forward and backward movement of the driving piston is therefore relatively frictionless poor, while still a safe positioning of the driving piston in his Ignition ready position is achieved.

The inclination and the axial length of the mentioned wedge surface are in coordination with the behavior of the braking element so chosen as to slow down the piston shortly before reaching its ignition ready position is. The wedge surface can extend to the head of the Kol bens extend or again in a rear cylindrical section hen, the diameter of which is again the front cylindrical section can correspond if it is only ensured that the rear cylindrical Ab cut did not reach the braking element at any of the piston positions.

In an embodiment of the invention, the wedge surface can be a flat surface or a Be conical surface. The shape of the braking element could match the shape of the Area to be adjusted. But it is also possible to use the braking element as a ball, Form roll, roller or disc and roll or slide it on the surface tend to run out.

According to a further embodiment of the invention, the brake can ment in a radial recess to a piston guide and through Spring force in the direction of the driving piston.

This can e.g. B. done in that a bottom surface of the recess in Forward direction is inclined to the central piston axis and the braking element with means of an axial spring in the forward direction against a wall of the recess ge is pressed. In this case, the inclination of the bottom surface of the recess  and the wedge surface of the drive piston the braking effect on the drive piston can be adjusted.

However, it is also possible to design the braking element itself to be elastic, and at least in the radial direction of the driving piston. It could then be between a bottom surface of a recess and the driving piston kept tensioned to then tighten when the drive piston moves in the forward direction ben when the wedge surface is moved along under the braking element.

An elasticity in the radial direction of the driving piston could be for the brake ment but also be made available in that the floor area the recess itself is designed to be elastic or resilient.

It would also be advantageous to be uniform over the circumference of the driving piston to provide spaced apart braking elements that symme as possible Introduce braking forces radially into the driving piston in order to achieve this not load unevenly.

An embodiment of the invention is described below with reference described in more detail on the drawing. Show it:

Fig. 1 is a partially illustrated in section, the setting device, wherein the OF INVENTION dung contemporary piston holder can be used;

Figure 2 is an axial section through the piston holder according to the invention in a located in Zündbereitschaftsstellung driving piston. and

Fig. 3 shows the axial section of FIG. 2 with a driving piston displaced in the setting direction or forward direction.

Fig. 1 shows a powder-powered setting tool that can work with the piston holder according to the invention. But it could also be a setting tool that can be operated by igniting an air / fuel gas mixture.

The setting tool shown in FIG. 1 has a housing 1 with a handle 2 and trigger 3 . A stop sleeve 4 is screwed to the end of the housing 1 on the driving direction. A two-part piston guide 5 is slidably mounted in the housing. The piston guide 5 consists of a rear part 6 and a front part 7 . In the piston guide 5 there is a driving piston ben 8 with a head 9 guided in part 6 and a shaft 10 guided in part 7 . In a guide bore 11 of part 6 , a flow channel 12 opens at the rear for the expansion gases of a powder propellant charge. On the front, the part 6 has openings 13 for discharging the air in front of the head 9 when the driving piston 8 is advancing. The front end region of part 6 concentrically overlaps the rear region of part 7 . The part 7 protrudes beyond the stop sleeve 4 and thus forms a muzzle tube. The rear end of part 7 can protrude in the form of a tubular extension in the guide bore 11 and thus form a stopper the travel of the driving piston 8 be limiting.

The shaft 10 of the drive piston 8 has a front cylindrical section 10 a and an offset to the rear end of the drive piston 8 at the closing wedge-shaped or conical section 10 b. This ko nus-shaped section 10 b has a rearward inclined to the piston central axis wedge surface, so that the pointed end of the cone points towards the head 9 of the driving piston 8 .

A receiving space 14 located at the front end of the setting tool serves for receiving one or more braking elements.

Figs. 2 and 3 show in an enlarged representation of the conditions in the region of the receiving space 14 of the setting device of FIG. 1.

The shaft 10 of the driving piston 8 is guided in a piston guide 15 which is located in part 7 . The central axis of the shaft 10 is provided with the reference character 16 . To recognize the forwardmost zy-cylindrical portion 10 a of the shaft 10 and the thereto adjoining the rear end of the drive piston 8 cone-shaped portion 10 are shown in Figs. 2 and 3 b of the shank 10. The setting direction or forward direction of the driving piston 8 is indicated by the arrow 17 . The conical section 10 b of the shaft 10 be sits a wedge or peripheral surface 18 which is inclined by the angle α relative to the piston central axis 16 . Starting from the cylindrical section 10 a, the angle α opens in the direction of the rear end of the driving piston 8 . B to the conical section 10 either directly to the head 9 can be connected or of the driving piston 8, a further cylindrical portion toward the rear end. This is not shown in detail.

At the rear end of the front part 7 there is a circumferential recess 19 which has side walls 20 and 21 spaced apart from one another in the axial direction, and has a bottom surface 22 . The side walls 20 and 21 are each in planes perpendicular to the central piston axis 16 , while the Bo denwand 22 is conical surface-shaped and in the setting direction 17 to the central piston axis 16 is inclined. Within the circumferential recess 19 lie gene at equal angular distances from each other in the circumferential direction of the driving piston 8 spherical brake elements 23rd Each spherical brake element 23 is pressed by means of an axially extending compression spring 24 in the direction of the side wall 20, the compression spring 24 being present in an axially extending recess 25 from part 7 .

Fig. 2 shows the piston holder in a state in which the driving piston 8 is in the ignition ready position. Here, the spherical brake element 23 is pressed by the compression spring 24 against the inclined Bo denfläche 22 , whereby the force of the compression spring 24 is deflected radially in the direction of the drive piston 8 . The ball 23 thus presses on the cylindrical portion 10 a of the shaft 10 and holds the driving piston 8 in the ignition ready position.

If the driving piston 8 is moved in the setting direction 17 approximately after the setting tool has been ignited, it is initially braked by the action of the ball 23 as long as it acts on the cylindrical section 10 a. Comes the ball 23 into the tapered portion 10 b, so the compression spring 24, the Ku gel 23 initially continue to press and towards the front side wall 20 so that still a certain amount of friction between ball 23 and shank 10 can be maintained. It should be noted that the bottom wall 22 is somewhat steeper than the wedge surface 18 . Finally, the ball 23 comes to rest on the front side wall 20 , but with further movement of the driving piston 8 in the setting direction 17 the wedge surface 18 is increasingly removed from the wall of the guide channel 15 , so that finally the force of the compression spring 24 no longer applies the ball 23 can be transferred to the shaft 10 . This is now free. The corresponding state is shown in Fig. 3.

When the driving piston 8 moves counter to the setting direction 17 , the ball 23 is initially carried along by the wedge surface 18 , and the spring 24 is compressed. It should be noted here that the bottom surface 22 in turn is steeper than the wedge surface 18 . The ball 23 can therefore move to the right in FIG. 3. Finally, the cylindrical portion 10 a under the Ku gel 23 , so that now the force of the compression spring 22 is deflected via the ball in this section 10 a, the ball 23 being supported on the sloping bottom surface 22 . This state corresponds to that shown in FIG. 2.

Claims (8)

1. Piston holder, in particular for a driving piston ( 8 ) of a setting device, which has a cylindrical section ( 10 a) and an adjoining the rear end of the driving piston ( 8 ) offset wedge-shaped section ( 10 b) with a rearward to the piston central axis ( 16 ) inclined wedge surface ( 18 ), with at least one braking element ( 23 ), which in an operational standby position of the driving piston ( 8 ) presses against the cylindrical section ( 10 a) and whose compressive force on the driving piston ( 8 ) is reduced if the braking element ( 23 ) comes to rest against the wedge surface ( 18 ) when the driving piston () moves in the forward direction.
2. Piston holder according to claim 1, characterized in that the wedge surface ( 18 ) is a conical surface.
3. Piston holder according to claim 1 or 2, characterized in that the braking element ( 23 ) is designed as a ball, roller, roller or disc.
4. Piston holder according to claim 3, characterized in that the braking element ( 23 ) in a to a piston guide ( 15 ) radial recess ( 19 ) and is pressed by spring force ( 24 ) in the direction of the driving piston ( 8 ).
5. Piston holder according to claim 4, characterized in that a bottom surface ( 22 ) of the recess ( 19 ) is inclined in the forward direction to the piston center axis ( 16 ) and the braking element ( 23 ) by means of an axial spring ( 24 ) in the forward direction ( 17 ) against one Wall ( 20 ) of the recess ( 19 ) is pressed ge.
6. Piston holder according to one of claims 1 to 5, characterized in that the braking element ( 23 ) is designed as at least in the radial direction of the driving piston ( 8 ) elastic element.
7. Piston holder according to one of claims 4 to 6, characterized in that a bottom surface ( 22 ) of the recess ( 19 ) is resilient or fe formed.
8. Piston holder according to one of claims 1 to 7, characterized in that several in the circumferential direction of the driving piston ( 8 ) arranged at the same angular spacing brake elements ( 23 ) driving piston wedge surfaces ( 18 ) are arranged opposite one another.
DE2001105883 2001-02-09 2001-02-09 piston holder Active DE10105883C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2001105883 DE10105883C2 (en) 2001-02-09 2001-02-09 piston holder

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2001105883 DE10105883C2 (en) 2001-02-09 2001-02-09 piston holder
FR0201491A FR2820670B1 (en) 2001-02-09 2002-02-07 Holder piston
US10/071,692 US20020108488A1 (en) 2001-02-09 2002-02-08 Piston support

Publications (2)

Publication Number Publication Date
DE10105883A1 DE10105883A1 (en) 2002-08-22
DE10105883C2 true DE10105883C2 (en) 2002-12-05

Family

ID=7673393

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2001105883 Active DE10105883C2 (en) 2001-02-09 2001-02-09 piston holder

Country Status (3)

Country Link
US (1) US20020108488A1 (en)
DE (1) DE10105883C2 (en)
FR (1) FR2820670B1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1478837B2 (en) * 1965-11-09 1975-06-12 Fa. Carl Bauer, 5600 Wuppertal
DE3819813A1 (en) * 1988-06-10 1989-12-14 Hilti Ag A powder driven setzgeraet

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE795855A (en) * 1972-02-23 1973-08-23 Termet Pierre Anchors in apparatus or similar bodies
US4405072A (en) * 1980-05-28 1983-09-20 Hilti Aktiengesellschaft Setting device powered by an explosive gas mixture
DE3151661A1 (en) * 1981-12-28 1983-07-07 Hilti Ag "Setzgeraet with highly strained gases treibbarem working piston"

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1478837B2 (en) * 1965-11-09 1975-06-12 Fa. Carl Bauer, 5600 Wuppertal
DE3819813A1 (en) * 1988-06-10 1989-12-14 Hilti Ag A powder driven setzgeraet

Also Published As

Publication number Publication date
US20020108488A1 (en) 2002-08-15
FR2820670B1 (en) 2004-07-09
FR2820670A1 (en) 2002-08-16
DE10105883A1 (en) 2002-08-22

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: HILTI AKTIENGESELLSCHAFT, SCHAAN, LI